Telephone apparatus



F. P. MANSBENDEL.

TELEPHONE APPARATUS.

APPLICATION FILED JUNE 13, 19M.

1,399,268, v Patented Dec. 6, 1921.

UNITED STATES PATENT oFFrca.

FRITZ I. MANSBENDEIi, OF BROOKLYN, NEW YORK, ASSIGNOR TO ULTRA.EARPHONE' 00., ENG, OF NEW YORK, N. Y., A. CORPORATION OF NEW YORK.

TELEPHONE APPARATUS.

1,399,268, Specification of Letters Patent. Patented Dec, 6,'1921Application filed June 13, 1917. Serial No. 174,481.

To all whom it may concern: tween a tip 16 and a conductor l7,'as Wellas Be it known that I, Fnrrz P. MANSBENDEL, to protect the connectionagainst corrosion j a citizen of the German Empire, and who and externalinjury, a cap 19 of insulating have declared my intention of becoming amaterial is designed to fit over the same and '1 citizen of the UnitedStates, and a resident is attached to the casing wall by means of a. ofBrooklyn, in the county of Kings and screw 20 whichpasses through thecap and State of New York, have invented certain the said casing walland is held in a nut 21 new and useful Improvements in Telephone withinthe casing. The said cap 19 is re-' Apparatus, of which the following isa specicessed sufficiently to permit its base to fit upfication. on theback of the casing 10, and at the same The invention relates totelephone receivtime to press the eyes over the'tips to insure ers ortransmitters, more particularly to a good contact and 'toseal theconnection. portable apparatus such as is intended for The conductors 18are brought out through use by deaf persons or with loud talking asuitable outlet 22 vcut into the under face apparatus, and designed tobe more sensitive of the cap 19, the entire attachment thus than thetype of receiver or transmitter in presentlng a smooth and finishedappearance general use, and affording a dust-proof cover for the con-The invention has for its object to provide ductor ends which are firmlyclamped upona rigid and substantial construction, consistand spread overthe tips 16. A positiveconing of few and simple parts; and whereintactis thereby insured without in any way 751" the tension placed uponthe armature may dlsturblng the internal circult; and the said 1 bereadily controlled or adjusted. A further conductors, furthermore, mayreadily and object of the invention is to provide a conconveniently bedetached from the instruvenient means of securing the conductors toment. the receiver terminals and of affording suit- In front of the polepieces 12 is nivotally able protection therefor. secured an armaturepiece 25, the same being" The nature of the invention will be bestlocated, for example, in a plane substantially understood when describedin connection 'lght angles to the diaphragm 26 of the rewith theaccompanying drawings, in whichceiver and the said piece is integralwith Fi ur 1 is a l n f th i str m t ith or rigidly attached to one endof an arm 27 ca remov d, whose other and rounded end 28 bears Fig. 2 isa vertical section therethrough, agalns the said diaphragm 26. The leverI taken on the line 2-2, Fig. 1. thus formed may be pivoted or fulcrumedFi 3 is a plan of the back of the instruin any convenient manner to thecasing 10;

ment and shows the manner of connecting and is herein d sclosed asattached to a flexthe conductors to the instrument terminals. ible strip29 whose ends are screwed to posts Fig. 4 is a similar View with theprotecting 0 eXtendlng upwardly fromthe bott f cap for the conductorsattached. h Ca ng. v

Similar characters of reference designate The diaphragm 26 is mounted 1nand carcorrcsponding parts throughout the several rled by a cap 31 whlchis internally threaded 96 views. to be screwed down over the top of theReferring to the drawings, 10 designates casing 10' correspondinglythreaded. The

a suitable casing within which is mounted. II10unt1Ilg 0f the jsald d pg 111 t ap in any convenient manner, a permanent may be effected manywell-known or spe a n t 11 h vin l 12 nd r id d clal manner to holdit-at the circumference 100 with energizing windings or telephone cur- 0the Cap and preferably near the outer rent coils 13. The coils 13 areconnected all thereof, as, for example, by means of through conductorslat with terminal rods-a suitable clamping ring 33 whereby the 15extending through the back of the casing saidcap and diaphragm become sounited 10 and insulated therefrom, said rods teras to be movable as onemember. The said minating in conical tips 16 for outside concap, also,is provlded'with a central open- I nection. The tips 16 are preferablyslightly mg 32 through winch the sound Waves are concaved and areadapted to receive eyes 17 emitted or received.

at the end of a pair offiexible conductors The end 28 of the lever arm27, as afore- 18. In order to insure a good contact besaid, bears uponthe diaphragm; and, by

